What is the formula of phosphorus pentabromide

What element breaks down into yttrium-90?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange